How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 11/23100.0*Chance wins title100.0*Promoted100.0*Average seed
Vasco da Gama 1 Sao Paulo 2 -15.3
-0.2
Vitoria 4 Gremio 2 -15.0
-1.1
-0.4
Cruzeiro 3 Flamengo 2 +1.1
-0.5
+0.0
Palmeiras 2 Ipatinga 0 -0.5
-0.8
-0.1
Week of 11/30100.0*Chance wins title100.0*Promoted100.0*Average seed
Ipatinga 1 Gremio 4 +7.6
+5.7
+0.6
Sao Paulo 1 Fluminense 1 +0.4
Internacional 1 Cruzeiro 0 +2.6
+0.2
Vitoria 0 Palmeiras 0 +1.3
+0.1
Flamengo 3 Goias 3 +1.2
+0.1
Week of 12/7100.0*Chance wins title100.0*Promoted100.0*Average seed
Gremio 2 Atletico-MG 0 +23.0
+0.2
Goias 0 Sao Paulo 1 No
-0.1
Points
Chance Will Win Championship